Improvement in balanced valves



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Patented Dec. 1,*1874.

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Balanced-Valves.

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Fzl'y TIL UNITED STATES PATENT OFFICE.V

CHARLES H. HUTCHINSON, OF MANCHESTER, NEW HAMPSHIRE.

IMPROVEMENT INV BALANCED VALVES.

Specification forming part of Letters Patent No. 157,286, dated December 1,1874; application tiled August 27, 1874.

' elevation, of the slide-valve and the mechanism applied thereto and to the steam-chest. Fig. 4 is a top view, Fig. 5 a longitudinal section, and Fig. 6 a transverse section, of the valve without its adjuncts-viz., the sectional frame, its elevators, and .their separator, to be hereinafter explained. Fig.-7 is a per. spective view of one of the said elevators. Fig. 8 is a perspective view of the separator.

In Letters Patent No. 152,950, dated July 14,1874,and granted to me, the verticallymovable frame or balance of the valve is represented as solid or in one piece, and provided on its sides with a metallic or other proper packing, the valve having a chamber and two parallel guides or partitions erected therein.

In the accompanying drawings the slidevalve is shown at A with its chamber B and partitions b b. The space between such partitions is closed at their ends in manner as represented, the closures a a being provided with horizontal flanges c c. The partitions and closures serve to form a chamber or space, h, within the chamber B, the parts ot' the chamber B that are outside of the partitions being for no purpose except to save metal in making the valve. Extending up from the exhaust-chamber Z of the valve, and through each of the said closures a a, is a hole or passage, e, which opens into the space beneath the next adjacent ilange c. There are also two holes or passages, f f, made through the top of the chamber d into the space h that is between the partitions b b. rlhe space or chamber d is the exhaust cavity common to balanced slide-valves. The space h constitutes a chamber to receive the elevators and retainer, to be hereinafter described.

Surrounding the chamber B on its sides and ends are vertical grooves t' i z' i, provided with openings 7c 7c at their junctions. These openings k Za are made by the plane used in forming the grooves, and are of no special advantage.

The balance-frame D of the valve, composed of four sections or separate parts, Z Z Z Z, as shown, is received in such grooves i i z' i and plays vertically therein.

Fig. 9 is an inner side view, and Fig. l0 an inner end view, ot' one of the sections Z. Each of them is composed of two vertical plates, m n, arranged at right angles to each other, and to horizontal flanges o p, projecting from them in manner as represented. A groove, q, extends along in the said flanges, it being of a width less than tho thickness of its plate, m or mand said groove having one or more passages, r, leading from it into the space below* the anges. This groove is to intercept any steam that may leak by the edge of the balance-frame, and allow it to pass off without causing the frame to drop away from the plate F at the top of the steam-chest. The valve and its balance-frame, as shown in my aforesaid patent, were provided with a pair ot' rocker-levers, which I have dispensed with,

and in their place use' other means of elevatg` ing the balanceframe-viz., two elevators, N N, each being composed of a right-angular block, s, provided with a cross-bar, t, all being as shown. These elevators, arranged in the space h, extend underneath the iianges c c and across said space. The cross-bars t project underneath the flanges of the sectional balance-frame D. The elevators are kept in place and allowed to rise or fall by means ot' the separator or retainer H arranged between them, it being a flat plate bent ,up at right angles near its ends, and having holes u u through it at the bends, as shown. The separator or retainer insures the elevators being kept in place and rising and falling vertically.

The object of making the frame D in sections and with langes, as described, and the valve with the grooves to receive such sections, is to avoid the necessity of packing as tage against the plate F, tlltop lianges of the frame operating to preserve the balance from wear, such as it would be liable to were it without such langes. On steam being let into the chest, such steam will pass underneath the two elevators and force them npward, and cause them to elevate the sections of the frame D to the plate F. Any steam that at any time may be in the spaces Within the elevators will escape through the passages e e of the closure. The steam acting on the lower edge of the frame D will also operate to elevate such frame.

I claim- 1. `Each of the balance-frame sections l, as provided with the steam-intercepting groove g, and one or more passages, 1^, leading therefrom, as set forth.

the sectional balance-frame D, all being to opcrate as set forth. CHARLES H. HUTCHINSON.

Witnesses:

R. H. EDDY, J. R. SNOW. 

